Cloning breaks include list

[lysenkooo]

When I clone 'has_many' associations, gem tries to exclude it because he thinks it's through associations. It looks like bug in condition here https://github.com/amoeba-rb/amoeba/blob/master/lib/amoeba/cloner.rb#L68. It should return if it's not through association, but it doesn't and run exclude method. It breaks my includes list.